An efficient regional ionospheric model using combined GPS/BeiDou observations

作者：Abdelazeem Mohamed; Celik Rahmi N; El Rabbany Ahmed

来源：Journal of Spatial Science, 2017, 62(2): 323-335.

DOI：10.1080/14498596.2016.1253512

• GPS
• BeiDou
• ionosphere modelling
• PPP
• TEC
• inverse distance weighted (IDW)

In this study, we develop a regional ionospheric model (RIM) based on the GPS-only observations and the combined GPS/BeiDou observations for single-frequency precise point positioning (SF-PPP) users in Europe. GPS/BeiDou observations from 16 reference stations are processed in the zero-differenced mode. A least-squares algorithm is developed to determine the total electron content (TEC) bi-linear function parameters for a 15-min time interval. The inverse distance weighted (IDW) interpolation technique is used to create the vertical TEC maps for a 1 degrees x1 degrees grid. The developed models are evaluated for PPP applications using GNSS observations from another set of reference stations. The SF-PPP accuracy and convergence time obtained through the RIMs are assessed and compared with those obtained through the International GNSS Service Global Ionospheric Maps (IGS-GIM). The results show that the RIMs accelerate the convergence time and improve the positioning accuracy in the horizontal and height components in comparison with the IGS-GIM counterparts.

• 出版日期2017-9